Functional Overview; Control Console; High Voltage Power Supply - CPI Indico 100 Series Service And Installation Manual

CPI Canada Inc
7.1

FUNCTIONAL OVERVIEW

The following is a functional overview of the three main subassemblies that comprise the complete
generator.
7.1.1

Control Console

•
The console uses LED and LCD displays, to allow the operator to view the exposure parameters
selected. The radiographic display has a section for kV, mA, exposure time and a density display for
AEC applications.
•
The LED and LCD displays on the console also provide information to the operator regarding
conditions of the generator and programming functions, along with any error messages. The console
also has several pushbuttons to select the different operating modes and features of the generator.
Among the available operating modes and features are: AEC; ABS (automatic brightness
stabilization); mA/ms (current/time); mAs (current-time product); film screen - fast, medium and detail;
focus/filament - large or small; six bucky/image receptors; AEC field - left, centre, right; X-ray
preparation; X-ray exposure and generator ON/OFF buttons.
•
Inside the console there is a microprocessor that executes the main operating system program. This
includes an EPROM which contains the main program code, and a RAM chip which contains tables
for use with the main program, such as generator status and error messages. Tube limit data and
automatic programmed radiography (APR) exposure parameters are also stored in RAM. A battery
located inside the console supplies power to the RAM chip to ensure that the data is non-volatile, and
to keep the real time clock operational when the power is switched off.
•
The LCD display receives its power from a high voltage DC to AC converter, and the console switches
interface with the microprocessor through ribbon cables.
•
The communication between the console and the generator is achieved via a 15 pin shielded cable.
This cable provides a bi-directional serial link from the console to the generator control circuits.
Operational commands and status signals are sent, via this link, from the console microprocessor to
the generator CPU board.
7.1.2

High Voltage Power Supply

The power supply section of the generator contains three separate power supplies:
•
The high voltage (kV) supply, which includes the inverter modules and the high voltage oil tank and
other circuits, delivers up to 150 kV and up to 1000 mA (depending on model) between the anode and
cathode of the X-ray tube.
•
The filament supply board provides up to 6.5 amps to the selected filament in the X-ray tube. The X-
ray tube current is monitored by the generator control electronics and fed back to the filament supply.
The filament supply will make adjustments to the filament current in order to maintain a stable X-ray
tube current over the length of the X-ray exposure.
•
The rotor supply (LSS or DSS) contains the circuits needed to drive the stator windings of either one
or two X-ray tubes.
Indico 100 Series Service Manual Ch # 740895-06 Rev. A
7
Theory of Operation
Page 7-3